What’s Vulnerable › Vulnerabilities

CVE-2011-10020: Kaillera 0.86 Server DoS via Malformed UDP Packet

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-20 · updated 2026-06-16
• Weakness: CWE-20

Description

Kaillera Server version 0.86 is vulnerable to a denial-of-service condition triggered by sending a malformed UDP packet after the initial handshake. Once a client sends a valid HELLO0.83 packet and receives a response, any subsequent malformed packet causes the server to crash and become unresponsive. This flaw stems from improper input validation in the server’s UDP packet handler, allowing unauthenticated remote attackers to disrupt service availability.

Affected products

• Kaillera Project Server: through 0.86

References

• http://kaillera.com/
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/games/kaillera.rb
• https://www.exploit-db.com/exploits/17460
• https://www.vulncheck.com/advisories/kaillera-server-dos-via-malformed-udp-packet
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/games/kaillera.rb
• https://www.exploit-db.com/exploits/17460

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